FLAGELLATE PROTOZOA (MASTIGOPHORA) 



247 



28 (27) Free, like Monas, but with the anterior end ol^Hque. 



Physomonas Kent. 

 Representative species Physomonas elongala Stokes icS86. 



Body elongate-ovate, changeable in shape; free-swimming or temporarily 

 attached by a very short pedicel. Flagella two, unequal. Contractile 

 vacuole anterior in position. Length about 1 2 n. Swamp water. 



Fig. 374. Physomonas elongata. cv, contractile vacuole; n. nucleus 

 X 1000. (After Stokes.) 



29 (22) Forming colonies. Two flagella -^o 



30(33) One zooid upon the end of each branch 31 



31(32) Pedicel rigid. . Deudromomis Stein. 



Representative species Dendromonas virgaria Weisse 1845. 



Body of zooid pyriform, compressed, with an anterior, 

 lip-like projection from the base of which arise the two 

 unequal flagella. Nucleus single; contractile vacuole one 

 or two. Colony branching dichotomously. .\ colony may 

 include over one hundred zooids. Length of zooid 8 to 10 u. 

 Pond water. 



Fig. 375. Dendromonas virgaria. Colony X 160; single zooid X 935 , 

 (After Blochmann.) 



32(31) Pedicel flexible Ramosoiiema Kent. 



Representative species Ramosoncnia laxum Kent 1871. 



Zooids pyriform, compressed, obliquely truncate anteriorly. Pedicel 



very slender, threadlike. A colony may include as many as twenty or 



XWlVym^/ "i^ more zooids. Length of zooids 8 m- Pond water. 



K^UuT r ■ Fig. 376. Ramosonema laxum. cf, contractile vacuole; n, nucleus. Colony X 350; 



single zooid X 1000. (After Kent.) 



3i (30) Many zooids upon each branch 34 



34 (35) Stalk short, branching dichotomously once or twice. 



Ccplhdothamuiiim Stein. 

 Representative species. . Cephalotliamniitm cacspitosum Kent 1880. 



Zooids irregularly pyriform, in clusters of two or three 

 or as many as si.x or eight on the summit of a simple or 

 slightly branched pedicel. Pedicel very short. Length 

 of zooid about 6 m- Fresh water, attached to Cyclops. 



Fig. 377. Cephalothamniumcacspitoium. X 875. i.Uter Conn.) 



